Effect of Guide Vane beside Maintenance Rail on Vortex-Induced Vibration of Streamlined Box Girder

In order to study the vortex-induced vibration performance of streamlined box girders and seek effective mitigation measures, a long-span cable-stayed bridge with steel-box girder was taken as an example to investigate the vortex-induced vibration of the main girder through section model wind tunnel tests at a scale of 1:50. The two-dimensional flow field around the cross section of the main girder was modeled by computational fluid dynamic numerical simulation. The results show that alternate vortexes formation and shedding are repeated periodically behind the maintenance rails, which means that the rails have a significant impact on the vortex-induced vibration. The root mean square value of lift coefficient has a 24% reduction when the guide vanes move from the outside to the inside of the maintenance rails, implying that the vortex-induced vibration can be effectively mitigated by setting guide vans inside the maintenance rail.